What is "sleep tight"

interj. (context nightly farewell English) good night phr. If you keep yourself tightly bundled you will sleep warm and rest well.

"Sleep Tight" is episode 16 of season 3 in the television show Angel.

Sleep Tight may refer to:

• Idiomatic expression for "sleep well".
• Sleep Tight, a novel by Matthew J. Costello.
• Sleep Tight, the 1958 winner of the Goodwood Handicap, a Group 1 Australian thoroughbred open handicap horse race
• "Sleep Tight", a song by Sarah Brightman from her 1997 Time To Say Goodbye single
• "Sleep Tight" (Angel), a 2002 episode of the television series Angel
• "Sofðu vært" (English "Sleep tight"), a song by Todmobile from their 1991 album Ópera
• "Sleep Tight", a song by Celine Dion from her 2004 Miracle album
• "Sleep Tight", a song by Private Line from the 2004 motion picture soundtrack Levottomat 3
• "Sleep Tight", a song by Dragon Ash from their 2006 single Few Lights Till Night
• "Sleep Tight", a song by Kill Hannah from their 2006 album Until There's Nothing Left of Us
• "Sleep Tight", a song by Big Bad Voodoo Daddy from their 1999 album This Beautiful Life
• Sleep Tight (film), a 2011 Spanish film

Sleep Tight (, "While You Sleep") is a Spanish horror thriller film directed by Jaume Balagueró and was written by Alberto Marini. The film was developed under the title Flatmate.